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Debt Securities Held-to-Maturity - Mortgage Backed Securities Held-to-Maturity (Details) - USD ($)
$ in Thousands
Jun. 30, 2021
Dec. 31, 2020
Schedule of Held-to-maturity Securities [Line Items]    
Amortized Cost $ 6,417 $ 7,234
Gross Unrealized Gains 286 340
Gross Unrealized Losses 0 0
Estimated Fair Value 6,703 7,574
Mortgage Backed Securities Pass Through Certificates    
Schedule of Held-to-maturity Securities [Line Items]    
Amortized Cost 6,417 7,234
Gross Unrealized Gains 286 340
Gross Unrealized Losses 0 0
Estimated Fair Value $ 6,703 $ 7,574